Flow Screeding costs ballpark + advice

[crispy_wafer]

2 minutes ago, ruggers said:

Another good job ticked off. Be interested to know what the finished level is like once dry and how smooth. Does it still require a self levelling compound over it if karndean or vinyl click was to be used? Did you go with cemfloor or the anhydrite type?

It's cemfloor so this one is cement based.  It looks good, but the proof is when you need to start the finish flooring, I would think there is likely to be the odd high spot/low spot but nothing that cannot be dealt with adhoc.  I'm going to be bonding engineered wood to it, so just a little bit more forgiving than karndean - which I would think needs billiard table smooth.  I've given myself 25 - 30mm to the underside of the front door so bags of room 🤣.  All in all, it was 7 and a bit cube.

 

[crispy_wafer]

1 hour ago, Thorfun said:

awesome! lovely ufh pipework as well. I was a bit gutted when ours was covered over, never to be seen again.

🤣 touches wood, I certainly hope to never see any of it again...  

[ruggers]

57 minutes ago, crispy_wafer said:

🤣 touches wood, I certainly hope to never see any of it again...  

I can imagine that not wanting to see any of it again. How accurate was the amount you used vs what you predicted, did you expect 7.5m3 at 70mm deep?

[crispy_wafer]

Off plan they quoted approx 6 cube at 55mm, but I increased the depth to 60mm, and I knew I had some lower spots on the floor that needed a bit more screed.  That was where the builders had stacked pallets of blocks of all things, only upset the camber on the beams by 5mm or so, but it all needs filling in I guess, so I'm quite content with that.  I'll just need to eat bread and water for another couple of months after completion. 

[crispy_wafer]

Yes, going back to the original quote 7.5 @70mm, I dare say would have ended up with (finger in the air) about 9 cube or so.  I guess that would have been about a 20% uplift, quite a bit really...

[Canski]

I was talking to a site manager today who has just completed about 400m2 of cemex over UFH. He said that they had ordered 20% more screed than they needed based on area x depth. He is convinced that the pipe work accounted for the 20% 

I doubt if it’s that much but what are other peoples experiences ? The pipes must eat up some of the volume but I haven’t worked it out yet. 

[markc]

20% has to be way over the top unless screed is very thin and pipe runs very close together to make up 20% of volume. Not that difficult to work out given area, screed depth and length of pipe laid

[crispy_wafer]

Site conditions, insulation could vary in thickness, not all uniform in dimensions, doesn't need to be much, but 5mm over 50m2 could make a difference, camber, or depression on the b&b floor.  It's not my day job, so how much volume the pipes take at 150mm centres doesn't bother me too much, my arse wont get kicked for qty mistake.  Too much thinking to be done about what I've got on in the office tomorrow, buying plumbing supplies, and why I should buy one treatment plant over another...

[Mr Punter]

At 150 ctrs and 70mm screed depth the 16mm O/D pipe will be 2.5% of the volume.  I think @Canski's site manager was trying to cover his bad estimating.

[Thorfun]

37 minutes ago, crispy_wafer said:

and why I should buy one treatment plant over another...

been there, done that, got the T-shirt (and by T-shirt I mean STP)